Prime mover control apparatus of the fluid pressure type



PRIME MOVER CONTROL APPARATUS OF THE FLUID PRESSURE TYPE Filed Aug. 25,1944 4 Sheets-Sheet 1 1950 I H c MAY 2,501,729

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IN VEN TOR BY a m ATTORNEY March 28, 3950 H. c. MAY

PRIME MOVER CONTROL APPARATUS OF THE FLUID PRESSURE TYPE Filed Aug. 23,1944 4 Sheets-Sheet 2 1 N VEN TOR Harr 63 my a1 fig. 2 A24 426 426 42? ATTORN E Y F El 9 5 M N R O R. Y 2 E DO T M 7 t T R U E 0. e 5 AT FC T IN I m P W% M m R 0 s H... OQDHLOURM V 0 5 & U O N 4 O E 5 T A N T T 2 tFm ww r r m W N5 S A 4 W E a W S w F a V s m "0 95 9 N E A mm U fiwv m mP C P E E M W I L L EE Mm R 5 am m .CD H w mm W 5 M 9 ET M m m 7 0.

March 28, 1950 H. c. MAY

- PRIME MOVER CONTROL APPARATUS OF THE FLUID PRESSURE TYPE 4Sheets-Sheet4 Filed Aug. 23, 1944 INVENTOR.

Harry CfMa y 6141 ATTORNEY Patented Mar. 28, 1950 uirso STAT-S PRIMEMGVER CONTROL APPARATUS OF THE FLUID PRESSURE TYPE Harry-C..May,.EastMcKeespont, .Pa., assignor to The Westinghouse Air Brake Company, Wil-.merding, Pa.,.a corporation. of Pennsylvania Application August'23,19.44, Serial No. 550,691

.22 Claims.

er for reversing its direction-of movement until after thepriniemover-has come to acomplete stop.

Another object of the invention isthe provision of a control apparatussuch as above. defined embodying means operableautomatically to limitthe speed of theprime mover inhoth directions of operation.

A further object of theinventionis the provision of acontrol-apparatusfor a locomotive of the type embodying apressurelubricating systern, so constructed as to cutoff the supply of motivepower in case the pressure .of lubricant in said system becomesreducedtoan undesirable low degree.

According to the above objects, the control apparatus is particularlyadapted though not limited, for usein controlling araillocomotive of thetype embodying atorward steam turbine for driving the locomotive in anahead direction and a reverse steam turbine 'for driving thelocomotivein the reverse direction. ,An operators control device is providedforselectivelysupplying steam to either one of the turbines, and meansresponsive to movement of-the locomotive is operative to prevent thesupply of steam to theiorward turbine while the locomotive is moving inreverse or to the reverse-turbine while'thelocomotive. is m n orard-since it-is not desired to use the turbines 'forbraking purposes; Apressure "lubrieating system is provided for maintaining-arsupply oflubricant unde constant pressure to the bearings of the turbines andother :parts of the locomotive, and the controlapparatus embodies meanscontrolled "by the pressure of lubricant in said system forautomatically cutting. offithe supply of steam to the driving turbine incase the pressure of lubricant 'becomesreduced to a chosenlow'dcgree,due-fo instance to a failure in any part of-the lubricating system. Awarning device, also controlled by "the pressure in thelubricatingsystemgisprovidedfto warn'the opera ator ,incasethe pressureof'lubricantibecomes reduced to an undesirablylow degree- The-controlapparatus furtherembodies. means responsive-t0 the speed of therespective turbine and. consequently to the movementof the locomotive.in

either direction of. operation for limiting .the maximum speed of thelocomotive, and .said

means is alsooperable incase ofv slippingof the locomotive drivers onvthe :rails. to .cut oil the supply of steam to thedriving turbine soasto limit the speed or prevent racingof said turbine.

.Other objectsand advantages will be apparent from the following more.detailed description of the invention.

In the accompanying drawings; Figs. 1 and 2 .whenlaidsidebyside withFig.1 at theleft hand side of Fig. ,2, is av diagrammatic view, partly insection and partly inelevation, of a portion of a locomotive with the.improved control apparatus associated therewith; Fig.3.is apartial planview of an operators control device which, in Fig. .1,

..is.shown mainly in vertical section; Figs. 4 to 8 are sectional .viewstaken respectively on lines 44, 5-15, 5-15., .ll and -8-.8 on theoperators control valve .deviceshown in Fig. '1; Fig. 9 is a view atanenlargedscale and mainly in section of aportion of theoperators controldevice shown in Fig. 1; Fig. 10 is a partial plan .viewof the interiorof a portion of the operators control device as seenon line |lllll inFig. 9; Fig. 11, is a vertical sectional view of a throttle adjustingmotor two of which are shown in side elevation in Fig. '2; Fig. 12 is avertical sectional view at an enlarged scale of a zero speed or stopdetecting device shown in side elevation inFig. 2; andFig.

13 is a side elevational view of a portion of the device shown in Fig.12 as seen from the line 13-43 in Fig. 12.

Description.

In the drawings-the reference numeral I indicates a driveaxle of a raillocomotive. A reduction gear housing 2 is mounted on axle l and containsa driving gear wheel '3 secured to the axle I' for turning same. Thisvdrivinggear wheel is arranged to be operated by a smaller gear wheel 5mounted on a jack-shaft 5 which is journaled in the housing 2. The shaft5 is arranged to be driven by gear wheels 6 which mesh with smallerdriving gear wheels I mounted on and arranged to be driven by a shaft 8having bearings in the housing 2 and extending out from either sidethereof.

One end of shaft 3 is permanently connected to a forward steam turbine'9 which is arranged 3 to be operated by steam supplied through a pipeID for driving axle l to propel the locomotive in a forward direction.Numeral ll indicates an exhaust pipe from the turbine 9.

A reverse turbine I2 arranged to be operated by steam supplied through apipe l3 and having a steam exhaust pipe I4 is adapted to drive a shaft15. The shaft l5 extends into a reduction gear housing l6 containingmeshing gear wheels I! and I8, the gear wheel I! being secured to saidshaft and the gear wheel l8 being secured to a shaft l9 which isjournaled in said housing in coaxial relation with shaft 8 connected tothe forward turbine 9. A clutch element is rigidly secured to shaft 8 torotate therewith, and mounted on the adjacent end of shaft I9 is amovable clutch element 2| arranged to cooperate with the fixed clutchelement 20 to operatively connect the reverse turbine l2 to the axle lIt will be noted that the forward turbine 9 is at all times connected tothe locomotive axle while the reverse turbine may be connected ordisconnected as the case may be. Thus when the reverse turbine I2 isemployed for driving the lo omotive the rotor (not shown) of the forwardturbine will al o be operated, but the clutch elements 2!! and 2 Iprovide for the d sconnecting of the reverse turbine from the driveshaft 8 when the engine i bein driven by the forwa d turbine.

For operating the clutch to connect and disconnect the reverse turbinetG a'nd from the dr ve sha tfl here is rovided a fluid pressurecontrolled motor com'orising a cylinder 22 containing a piston 23 whichis operatively connected through a rod 24 to one end of a lever 25. Thislever is arran ed to rock about a fixed fulcrum 26 rovided intermediateits ends. The opposite end of the lever is in the form of a yokestraddlin the movable clutch element 2| and has operating engagementtherewith within an annular groove 21. At one side of the piston 23there is provided a pressure chamber 28 which is arranged to receivefluid under pressure from a. clutch control pi e 28 for actuating saidpiston to rock the lever in a clockwise direction to urge the movableclutch element 2| into driving engag ment with the fixed clutch element20 to thereby o eratively connect the reverse turbine [2 to the driveshaft 8. At the other side of the piston there is provided a chamberwhich contains a spring 30 which functions to move the piston 23 to theposition in which it is shown in the drawing upon the release of fluidunder pressure from pi e 29 and chamber 28 for disengaging the movableclutch element 2! from the fixed clutch element 20 to thereby disconnectthe reverse turbin l2 from the drive shaft 8.

The reference numeral 3| indicates a steam supply pi e on the locomotiveand this pipe is arranged to be constantly supplied with steam from thelocomotive boiler. A cut-off valve 32 is provided to open and closecommunication between the steam supply pipe 3| and a pipe 33, and whenopen will admit steam tothe latter pipe and thereby to two throttlevalve devices 34 and 35 which are adapted to regulate the supply ofsteam to pipes l0 and 13, respectively, and thus to the respectiveforward and reverse turbines 9' and I2.

The throttle valve device 34 may be of any suitable structure forregulating the supply of steam from pipe 33 to pipe in to effectoperation of the turbine 9 at any desired speed or degree of poweroutput. and for also cutting off the supply of steam to said turbine.For illustrative purposes only, the throttle valve device 34 is shown asbeing of the type arranged for control by movement of a lever 36 havinga steam cut-off position in which it is shown in the drawings, and whichis movable out of this position in a counterclockwise direction forsupplying steam to the turbine in an amount proportional to the extentof such movement. A dot and dash line 37 indicates a position which thelever 35 may assume to provide a maximum amount of steam to the turbine9.

The reverse throttle valve device 35 may be identical in construction tothe forward throttle valve device 34 and may therefore comprise a lever38 having a steam cut-off position in which it is shown in the drawing,and which is adjustable out of this position in a counterclockwisedirection for varying the supply of steam to the reverse turbine inproportion to the extent of such movement. The lever 38 may have aposition such as indicated by a dot and dash line 39 for providing amaximum amount of steam from pipe 33 to the reverse turbine 12.

Fluid pressure controlled throttle adjusting motors 4B and 4| areprovided for adjusting the levers 35 and 38 of the forward and reversethrottle valve devices 34 and 35, respectively. The construction andoperation of these throttle adjusting motors will be hereinafter morefully described.

The reference numeral 42 indicates a steam turbine which is connected tothe steam pipe 33 and which is adapted to operate continuously, i. e.,as long as there is steam pressure in said pipe. The turbine 42 isprovided for operating a lubricant pump 43 to supply lubricant from asupply pipe 44 to a pipe 45 and to maintain lubricant at a certainsubstantially constant pressure, such as 35 pounds per square inch, inpipe 45 at all times when the locomotive is in use. said pipe 44 beingsupplied with oil from any suitable source, such as a sump (not shown).

The pipe 45 may convey lubricant under pressure from pump 43 to thedifferent bearings in the forward and reverse turbines and in thereduction gears associated therewith and connecting said turbines to theaxle I and to any other part or parts of the locomotive where suchlubricant is desired. For instance the lubricant pipe 45 leads to theinlet of an impeller pump 48 arranged to be driven by the forwardturbine 9.

The pump 46 has an outlet to a pipe 41 whereby said pump will operate todraw oil from the constant pressure pipe 45 and deliver such oil to pipe41 at a greater pressure which willbe substantially proportional to thespeed of operation of the forward turbine and thereby to the forwardspeed of the locomotive for reasons which will be hereinafter described.A similar impeller pump 48 is arranged to be driven by the reverseturbine l2. The pump 48 has an inlet connected to the constant pressure.pipe 45-and has an outlet connectedto a pipe 49 so as to therebyprovide in this pipe 49 a pressurewhich will be proportional to thespeed of the reverse turbine and thus of the locomotive when saidturbine is used for propelling the locomotive rearwardly, also for areason which will be hereinafter described.

The two throttle adjusting motors 40 and 4! are identical inconstruction, each comprising, as shown in Fig. 11, a casing containinga double acting power piston 50 having a rod 5| extending through asuitable packing gland 52 to the exterior of the casing. The outer endof, rod 5! of motor 40 is operatively connected to one end of the. lever3Bhofthe throttlevalve devicei l, while in motor the endof saidvrodisconnected tov one vend ofllever 38 of the throttle valve ,device35.

At one side of the power pistonio-there is provided a control chamber53-which isconnected by way of a passage 54 to a pilot structure '55which is operative to vary the pressure of fluid in said chamber forcontrolling adjustment ofthe respective throttle valve device. At theopposite side of piston 50 there is provided a control chamber 56 whichis connected to a control passage 51 and which containsa springiflacting on said piston for urging same in the direction of the right-handto the position in which it is shown in the drawings. In motorthepassage 51 is connected to a pipe 59 whilein motor-M said passage isconnected to a pipe 60.

In operation, when fluid is supplied-tochamber 53 at a pressuresufficient to overcome the opposing pressure of spring 58, with chamber56 open to atmosphere, the piston will move against this opposingpressure of the spring, to a position in which the increase in pressureof said spring will counter-balance the pressure of fluid in chamber.53. U on a partial release of fluid pressure from chamber 53, thespring 58 will act to return the'piston 50 and rod5i-to a position wherethe pressure of said spring is reduced to a degree edual to that of thereduced pressure of fluid efiective in chamber 53, while unon a fullrelease of fluid pressure from chamber. 53, spring 58 will return piston50 to the position in which it is shown in the drawings. It will thus beapparent that the piston it may be caused to assume any po ition to theleft of theposition in which it is shown in Fig. 11 vbv oviding fluid att e proper pressure in chamber 53.

With pi ton 50 in the position in which it is shown in Fig. 11 thetlever36 or 33 of ,the respective throttle valve device 34 or 35 will becausedto assume the steam cut-oi? position as shown in Fig. 2. The piston 50as it is.moved out of the position in which it is shown in Fig. ll willoperate lever,36 or 38 to veffect the supply of ste m to the t r ine Qor52. respectivel in an amount proportional to the degree of suchmovement. It will thus be apparent that the amount of steam admitted toturbine '9 or [2 will vary in proportion to the pressure of fluideffective in chamber 53.

The pilot structure for controlling the pressure of fluid in chamber 53.comprises a flexible diaphragm 6| at one sideof which there is provideda chamber 62 to which is connected a control passage 63. The passage 63in motor 40 is connected to a control pipe 64, while in motor AI saidpassage is connected to a control pipe65. At the opposite side ofdiaphragm 6! there is provided a chamber 68 which is open to theatmosphere through a port 61. The casing of this structure 55 isprovided with bores 68 and 69 at opposite sides of and coaxiallyalignedwith the diaphragm 6i. 'One'endof bore :63 .iseopen to chamber 66. Theadjacent end of bore 691s open to chamber .62 while its O posite end isopen to. a larger bore 8 the outer end n'f which is closed by a cap nutH.

A stem 12 extending centrally through the diaphragm Bl andsec-uredthereto for movement therewith has one end portion 13 disposed to slidein the adjacent end portion. of .bore 68, while its opposite end portionHis mounted toslide .inv

bore 69. The portion 14 adjacent itsouter endvis provided with an:annular recess in'whichethereis disposed a sealing ring .15.i havingsliding .contact withtthe wall of the bore 69 for preventing leak age offluid under pressure ,from chamber 62. The outer end of portion 14 ofthe stem 12 ;engages the smaller end portion of a plunger 16, thelargerend portion 11 of which is disposed to slide inbore 10. In this largerend portion11 is an annular groove carrying a sealing ring 18 arrangedto prevent leakage of fluid under pressure from a chamber 19 at itsouter face to the space between said ring and the sealing ring 15, thisspace being constantly open to atmosphere through a passage 36 inplunger 16 and a registering passage M which extends through stem 12andis opento chamber 66 which is constantly in communication with theatmosphere by way of passage 61. Chamber 19 located at the outer face oflargerv end portion 11 of the plunger 16 is open to passage 54.

The end portion 13 of stem 12 disposed within bore 68 is provided withtwo spaced sealing rings 8Zhaving sealing and sliding contact with thewall of said bore to prevent leakage of fluid. under pressure past ringsfrom an annular recess 33 provided inthe peripheral surface of the stemand located between the rings. The recess 83 is open through a pluralityof ports 84 to an annular recess 85 in the casing and thence through apassage 88 to a pipe 81, at both of the djusting motors. The pipe 81 isconstantly supplied with fluid under pressure from a source suchas aconventional locomotive'main reser voir 88.

In each of the throttle adjusting motors the recess -83 isalso open to acounterbore 89 prov vided in the portion 13 of stem 12. The open end ofcounterbore 89 is closed by a nut 98 having sliding engagement with thewall of bore 68 andjalso having screw-threaded engagement with theinternal wal of counterbore 89 and thus the. nut is secured to the stem12 for movement therewith. The nut 98 has an axial bore one end of whichis open to a chamber 9| at the outer end of the'nut while the oppositeend is open to counterbore 89 within the stem, and slidably mounted inthis axial bore is a fluted stem 92 pro ecting from a fluid pressuresupply valve 93 contained in a counterbore S9 and arranged to seatagainst the ad acent inner end of said nut. A precompressed spring 94disposed in counterbore 89 acts on the supply valve 93 for urging thevalve .to its seated or closed position as shown 7 in ,Fig. 11.

The end of the supply valve stem 92 extends beyond theouter face of nut99 into chamber 9| and therein engages a reease valve 95 which hasafluted stem 96 slidably mounted in a bore provided axially in a plunger91 which is mounted to slide in a bore in the casing in coaxial relationwith the end portion it of the d aphragm operated stem .12. In theeripheral surface of plunger 91 are two spaced recesses, in each ofwhich is a sealing ring 58 having sealing contact with the wall or thebore for preventing leakage-of .fiuid under pressurefrom one side of 7each ring tothe opposite side. Between the two rings ,98 the plunger .9?has an annular recess $19 which isopen through one or more ports I00 toabore Hil within the plunger and into which bore the end of the releasevalve stem 95 projects. Theurecess 39 is also open through one or moreports 1.92 to a recess it? in the casing. The recess. we is in constantcommunication with the atmosphere through a passage Mid and a fitting,

H15 arranged .to prevent entryof insects, into said passage.

The outer end of bore IIJI in plunger 91 is closed by a plug I06 andbetween the inner end of said plug and the adjacent end of the releasevalve stem 95 there is interposed a precompressed spring IEJ'I forurging the release valve 95 out of seating engagement with the end ofthe plunger 91. In the outer end of plug I06 there is secured anadjusting screw I 98 and on said screw is a lock nut I09 for contactingplug I06 to lock said screw in an adjusted position. The outer end ofthe adjusting screw I08 bears against a lever I II], one end of which ismounted to rock on a pin III which is mounted in a fixed arm H2projecting from the casing. The opposite end of the lever is operativelyconnected, exteriorly of the casing, to the power piston rod by means ofa lug H3 projecting from said lever into an annular groove I I4 providedin said rod.

It will be noted that chamber 9| containing the release valve 95 isformed between the adjacent ends of the portion I3 of plunger I2 andplunger 91, and said chamber is open to passage 54 leading to chamber 53at the right hand side of the power piston 55 The passage 54 is alsoopen to chamber I9 provided at the outer face of plunger I6 as beforementioned and it is desired to point out that the enlarged portion 'I'Iof said plunger is of the same area as that of the nut 90 provided onthe end of portion 13 of plunger I2, whereby pressure of fluid eflectivein chamber 9| tending to urge the structure including diaphragm GI inthe direction of the right hand will be counter balanced by an equalpressure of fluid acting in the opposite direction in chamber IS on theenlarged portion TI of the plunger 16.

Carried by the casing and projecting into chamber 62 at the right handside of diaphragm 6| is a stop I|5 which is arranged to be engaged by aplate IE6 secured to the stem I2 for limiting deflection of thediaphragm 6| in the direction of the right hand. If desired a pluralityof such stops may be provided. In chamber 66 a precompressed controlspring I I1 encircles the stem I2. One end of this spring bears againsta wall of the casing, while the opposite end bears against a follower II9 which is provided on stem I2 for engaging the adjacent face ofdiaphragm 6|. This spring II! is operative to urge the diaphragm 6| tothe position in which it is shown in the drawings upon release of fluidpressure from chamber 62, and to oppose movement of said diaphragm inthe direction of the left hand upon supply of fluid under pressure tosaid chamber, and to cooperate with such pressure to define differentpositions of said diaphragm. Preferably the spring I! is precompressedto a degree which will move the diaphragm to the position shown in thedrawing against a relatively low pressure of fluid in chamber 62, suchas eight pounds.

Each of the throttle adjusting motors further.

embodies an insuring valve device II 9 comprising a poppet valve I29contained in a chamber |2I which is open to passage 54. The valve I20has a fluted stem extending through a bore into a chamber I22 which isopen to vent passage I04, said valve being thus arranged to controlcommunication between passages 54 and I 04, like the release valve 95,but under different conditions as will be later brought out. A springI23 in chamber 2| acts on valve I29 for urging it to closed position.

The fluted stem of valve I20 engages in chamber I22 a cylindrical stem I24 which slidably extends through a bore in a wall separating chamberI22 from a chamber I25 provided at one side of a piston I26 to which thestem is connected. Chamber I25 is open to atmosphere through a passageI21, and at the opposite side of piston I26 is a pressure chamber I28connected to passage 51.

The operation of the forward and reverse throttle adjusting motors 40and 4|, by reference to Fig. 11 will now be described.

Let it be initially assumed that the pressure of fluid in diaphragmchamber 62 is reduced to the low degree of eight pounds above mentionedby way of passage 63 and pipe 64 or 65 (Fig. 2). Under this conditionspring II'I will maintain the diaphragm 6| and stem I2 in the positionshown in Fig. 11 and the supply valve 93 will be closed by spring 94 toprevent flow of fluid from the main reservoir 88 past said valve tochamber 9|. Chamber 9| and the connected chamber I9 and chamber 53 atthe right hand face of the power piston 50 will, under this condition,be substantially at atmospheric pressure and the release valve will beseated for reasons which will be apparent from the description tofollow.

Chamber 53 being substantially at atmospheric pressure, spring 58 willmaintain the power piston 50 in the position in which it is shown in thedrawings. Thus when the pressure of fluid in diaphragm chamber 62 is atsubstantially eight pounds, the power piston 59 will actuate lever 36 or38 of the respective throttle valve device 34 or 35 to cut off thesupply of steam to the respective steam turbine 9 or I2.

Let it now be assumed that it is desired to supply steam to the forwardturbine 9. To accomplish this, fluid under pressure will be sunpiedthrough pipe 64 to increase the pressure of fluid in chamber 62 in thethrottle adjusting motor 49. and this increased pressure, acting on oneside of diaphragm 6|, will overcome the opposing force of control springIll and will cause said diaphragm to deflect in the direction of theleft hand to a position where the increase in pressure of said springwill counter-balance the increased pressure of fluid in said chamber. Asthe diaphragm 6| is thus moved, the portion I3 of stem I2 will moverelative to and thus out of seating engagement with the supply valve 93.since the supply valve is held against movement by engagement withrelease valve 95 which, at this time, is held against movement byplunger 91, lever H9 and a relatively great reluctance of the powerpiston 50 to movement.

Upon the opening of the supply valve 93, fluid under pressure from themain reservoir 88, supplied through pipe 81 to bore 89 containing thesupply valve 93 will flow past said valve to chamber 9| and thence tochamber 53 at the right hand face of the power piston 50. When thepressure of fluid thus provided in chamber 53 becomes sufflcient toovercome the opposing force of spring 58, the piston 50 will move in thedirection of the left hand. After movement of diaphragm 6| ceases in aposition of said diaphra m corresponding to the pressure of fluidprovided in chamber 62, as above described, this movement of the powerpiston 50 will act through lever III! to allow movement of plunger 97 bypressure of fluid effective in chamber 9| in a direction away from thenut 98, and this movement of said plunger will permit movement of thesupply valve 93 by spring 94 toward its seat. The supply valve willfinally engage its seat in a position of the power piston correspondingto the position of said seat as predetermined by the pressure ofcontrolling fluid provided in chamber 62. When the supply valve 83closes. the flow of fluid under pressure to chamber 53 will stop andhence movement of the power piston 50 will cease in a positioncorresponding to the pressure of fluid effective in chamber 62.

It will thus be seen that upon a certain deflection of diaphragm 6| asdetermined by the pres sure of fluid provided in chamber 62, the powerpiston will adjust the'respective throttle control lever 36 out of itssteam cut off position shown in Fig. 2 to supply steam to the forwardturbine 9 in an amount proportional to the pressure of fluid provided inchamber 62 in excess of the ini tial eight pounds pressure effective inchamber 62.

If the respective throttle valve device 3 5 is adjusted as justdescribed to provide less than full steam supply to the forward turbine,the supply of steam may be increased by increasing the pressure of fluidin diaphragm chamber 62, whereupon the throttle adjusting motor All willoperate to correspondingly increase the supply of steam to the forwardturbine. Upon providin a maximum pressure of fluid in chamber 52 thethrottle adjusting motor 49 will cause movement of the throttle controllever to the position indicatedb'y the dot and dash line 3'! forsupplying the maximum amount of steam to the turbine.

On the other hand, if the operator desires to reduce the amount of steamsupplied to the forward turbine 9 he will reduce the pressure of fluidin diaphragmchamber 62 to a desired degree. Spring II? will then movethe diaphragm SI in the direction of the right-hand to a new positioncorresponding to the reduced pressure of fluid. As the diaphragm 6| isthus moved to: ward the right hand, it will carry with it the supplyvalve 93 and the supply valve stem 92, thus rendering spring I07effective'to move the release valve 95 with the supply valve andrelative to the plunger S'Iout of seating engagement with said plunger.Upon thisopeningof the release valve 95, fluid under pressure will bereleased from chamber 9i and thus from chamber 53 at the right hand faceof the power piston to atmosphere through passage I04. When the pressureof fluid in chamber 53 in thus reduced, the spring 53 will move thepower piston 50 in the direction of the right hand. The piston as it isthus moved will operate the lever I It to move the plunger 91 in thedirection of the releasevalve. 95. movement of the diaphragm 6| andrelease valve 95 ceases in a position corresponding to the reducedpressure of fluid in chamber 6-2, this movement of plunger 9? will berelative to said valve and will finally eifect closure of said valve toprevent further release of fluid under pressure from chamber 53 so as tostop piston 59 in a position corresponding to the reduced pressure offluid in diaphragm chamber 62. Thismovement of piston 59 will operatethe throttle valve 3G to correspondingly reduce the amount of steamsupplied to the turbine 9, as will be apparent.

if a further release of fluid under pressure from chamber 62 iseffected, the power piston 50 will again move in the direction of theright hand to a correspondingly new position to effect a further andcorresponding reduction in the supply of steam to turbine 9, in the samemanner as just described. However, upon reducing the pressure offiuid'in chamber 62 to its minimum degree,

After such as the eight pounds above mentioned, the diaphragm IiI,supply valve '93 and release valve will return to the position in whichthey are shown in the drawings, whereupon the power piston chamber 53will be maintained open to the atmosphere past therelease'valve 95 untilsaid piston reaches the-position in which it is shown in the drawings,alt-which time; plunger 9? will seat against the release valve 95, andthi-soperation of piston 50 will actuate the steam throttle valve device3M0 cut off all steam supply to the turbine 9.

It will now be seen thatany desired amount of steam may be supplied tothe forward turbine 9 by providing fluid'at the proper selected pressurein pipe Gil while a reduction in pressure of fluid in said pipe to itsnormal minimum degree will effect the cutting off of the supply of steamto the forward turbine.

In a manner which will beapparent from the above description, itwillalso be seen that the supply of steam to 'th'e reverse turbine I2 may bevaried as desired or may be cut oil" by providing fluid at suitablepressures in the control pipe 65 for controlling operation of thereverse throttle adjusting motor ll.

In the operation above described, it will be noted that the cutting offof the supply of steam to either the reverse or forward turbine, uponrelease of fluid und'erpressure from chamber 53 in the respectivethrottle adjusting motor is dependent upon and effected-by spring 58acting on the power piston 50.

In order to positively ensure that the supply of steam will be cutoff'to the-non-operating turbine or turbines, i. e., to" the reverseturbine 9- when steam is being suppliedto the forward turbine I2} andvice versa, and to both turbines when it is desired to stop thelocomotive or hold it stopped, particularly in case'spring 58 in therespective throttle adjusting motor 40 or ii should become broken fluidunder pressure will be supplied through passage 51 to chamber 56 bymeans to be laterdescribed, which will act to move the pistonfill-to'its steam cut off position, in which it is shown in Fig. 11,with the fluid pressure released from chamber 53. To ensure the releaseof'fiuid pressure from chamber 53 under such conditions, even thoughspring II'I acting on the diaphragm 6| or spring I01 acting on therelease valve 95 should fail or become broken, which would preventopening of the release valve 95, the ensuring valve piston I26 will beoperated by fluid pressure supplied to passage 51 to unseat valve I28 soas to thereby open chamber 53 to atmosphere through the communicationby-passing said release valve. During operation of the throttleadjusting motors II and 4| for supplying steam to the respectiveturbines, spring chamber 58 and piston chamber I28 will be open toatmosphere and as a result the insuring valve I20 will be closed.

The selective control of the forward and reverse throttle adjustingmotors 4i] and 4! and of the clutch control cylinder 22, in accordancewith the desired direction of movement and stopping of the'locomotive,is arranged to be controlled by an operators control valve device I29.The control device 529 comprises a body portion I30 which is'mounted'onone face of a pipe bracket I3I; a throttle adjusting motor selectorvalve portion ltfii'which is mounted on another face of said bracket;andv acover I33 which is mounted 'on'the body portion I30.

The body portion I30 carries a hollow rock shaft I34 suitably journaledat opposite ends and secured against longitudinal movement, and mountedto slide Within said rock shaft longitudinally thereof is a plunger I35.Adjacent one end, the rock shaft is provided through one side with aslot, and the plunger I35 has an aligned through slot, and extendingthrough the slot in the rock shaft and into the slot in the plunger isan end portion I36 of an operators control lever I31. The rock shaft I34is provided at either side of its slot with spaced upstanding ears 533between which the portion I36 of the operators control lever isdisposed. Extending through the ends of the ears I38 and through theinterposed portion of the control lever I31 is a pivot pin I39 for saidlever, said pin being arranged at right angles to the axis of the rockshaft. In the inner end of the portion I36 of the operators controllever is a reces in which is disposed a pin l4!) which is secured inplunger I35. By this structure it will be seen that movement of theoperators control lever I31 about pin I39 in the direction of the lengthof rock shaft I34 will move the plunger I35 longitudinally in said rockshaft, while movement of the lever in a direction circumferentially ofthe rock shaft will turn said shaft and plunger in unison.

The cover I33 is provided with a slot through which the operatorscontrol lever I31 extends and which is adapted to define the path ofmovement of said lever. This slot comprises a central portion I4I whichextends parallel to the direction of the length of the rock shaft I34,and also comprises two oppositely extending portions I42 and I43 whichare arranged at right angles to the central portion I4I and which openrespectively to opposite ends of said central portion.

The operators control lever I31 has a Neutral position midway betweenthe ends of the central portion I4I of the slot, in which position saidlever is shown in the different views of the drawings. The lever I31 ismovable in one direction from Neutral" position to what may be called aForward selection position at the junction of the parts MI and I42 ofthe slot and then to a Stop" position a slight distance into the slotI42 from the Forward selection position. At the opposite or outer end ofthe portion I42 of the slot the lever I31 has a "Full steam position,the range of movement of the lever between the Stop position and theFull steam position constituting a speed control range or zone andproviding for varying the supply of steam to the forward turbine 9 from,respectively, a minimum amount to a maximum amount. The minimum amountis less than required to cause operation of the forward turbine 9 topropel the locomotive and is substantially equal to the steam slip inthe turbine so as to maintain the turbine warm when stopped in orderthat it will be in condition to operate efficiently when required forpropulsion. The lever I31 has at the opposite end of the portion I4I ofthe slot a Reverse selection position and in the portion I 43 of theslot Stop and Full steam positions for controlling the reverse turbineI2, the space between said Stop and Full steam positions constituting asteam varying range for said turbine, and the Stop position alsoproviding for supply of steam to the reverse turbine equal substantiallyto the turbine slip for the same reasons as above set forth inconnection with turbine 9. In portion I4I of the slot all steam to theturbines will be cut off as will be described in greater detailhereinafter.

These different positions of lever I31 are in dicated in Fig. 3 byappropriate legends, there also being shown the legend Forward at theremote end of the portion I42 of the slot and the legend Reverse" at theopposite end of the portion I43 of the slot, which last two mentionedlegends indicate the directions of movement of the lever from Neutralposition for obtaining ahead or reverse operation of the locomotive.

As shown in Figs. 1 and 9 the operators control lever I31 within thecover I33 comprises a rod I44 and, outside of the cover, comprises ahand grip portion I45 which is secured to said rod by screw-threadedengagement and by a set screw I46. Slidably mounted on the rod betweenthe hand grip portion I45 and the cover, is a detent I41, and carriedwithin the hand grip portion and acting on said detent is aprecompressed spring I48 urging said detent against said cover. As shownin Figs. 1, 3 and 9 the cover is provided at each of the opposite endsof the central portion I4I of the guide slot with a recess I49 arrangedto receive the detent I41 for resiliently holding said lever in eitherof said positions. Each of the portions I42 and I43 01' the guide slotis provided with an elongated recess I50 which is adapted to receive thedetent I41 and which provides for relatively free movement of theoperators control lever between the "Stop" and the Full steam positions,the detent being operative however to prevent unintentional movementfrom either Stop" position to the adjacent Forward selection" positionor Reverse selection" position.

The rod I44 is provided with a counterbore extending from the outer endof the operator's control lever to a point within the cover I33, andslidably mounted within this bore, is a plunger I5I. One end of plungerI5I is disposed adjacent the inner end of the counterbore and on theopposite end of the plunger there is secured a finger operated cap I52which projects beyond the outer end of the hand grip portion I45 of thelever, whereby the plunger may be moved inwardly of the rod I44 bypressure from an operator's finger. A double detent I 53 is slidablymounted on the rod I44 within the cover I 33, and a spring I54encircling said rod and supported on a collar I55 secured to said rodacts on said detent urging same in the direction of the inner surface ofthe cover. This detent is connected by a pin I56 to the plunger I5I,said pin extending through suitable oppositely arranged slots I51 in therod I44. These slots are so arranged as to be engaged at one end by pinI56 to limit upward movement of the detent I53 and. plunger I5I byspring I54 and to permit movement of said detent in the oppositedirection away from the inner surface of the cover by manual operationof said plunger.

The detent I53 is provided, on the side of rod I44 which is adjacent theportion I42 of the slot, with a plunger I58 which is urged in thedirection of the inner surface of the cover by a spring I59. A likespring pressed plunger I60 is provided in the detent at the oppositeside of rod I 44. Along the inner surface of the cover and adjacentopposite sides of the portion I42 of the slot are two gear toothed racksI6I and I62 which extend between the Stop and Full steam" positions forcooperation with the ends of plungers I58 and I 60, respectively, tosecure the operator's control lever I 31 in any selected speed or steamsupply position within this part of the slot. Oppositely arrangedtoothed racks I63 and i3 IE4 are provided alongthe opposite'sides of theportion I43 of the slot between the Stop and Full steam" positions forcooperation with plungers I53 and ltllrespectively, to secure theoperators control lever in any selected position within-this part of theslot. It will-be seen that the plungers I58 and IE6 may be releasedfromthe respective racks by moving plunger I I' inwardly by manual pressureapplied to the cap I52 projecting from the outer end of the hand gripportion I Q5 of the operator's control lever.

The teeth in-each pair ofracks HI, I 62' and IE3; I5 1 may be arrangedin staggered relation; so that when plunger I58 enters aspa'cetbetw-eentwo teeth on the respective rack" I B I or I 53; the plunger I553 willbe engaging the end of a tooth on its rack I62 or IM, and vice Versa,whereby-the operators control lever I 3-! will have a number ofpositions along each pair of-racks equal'to the sum of the spacesbetween the teeth on the pair of racks. In order to allow movement ofone of the plungers into a space between teeth on its rack under theaction of spring I54 when the other plunger engages the end of a toothon its rack, the respective spring I59acting on the other plunger will.yield.

If desired, however, the teeth on each pair of racks may be aligned witheach other so that the plungers I58- and I-BIJwill at the same timeenter recesses in the'respective racks. In such a structure the numberof positions of the operators control lever will equal onl the number ofrecesses between teeth on one rack. By this arrangement the springs I59could be dispensed with and theplungers I58 and I69 could be securedagainst movement in the detent I53 and might, if desired, be madeintegral parts of the detent.

Associated with the body portion I 30 of the operators control valvedevice is a forward steam cut-off valve device -I65'and a reverse steamcutoff valve device I 66.

The forward steam cut-off valve device I65 comprises a supply valve I6!which is contained in a chamber IE3 and which is connected by a L stemIii-e to a plunger I slidably mounted in a suitable bore in the casing.The casing has an annular recess encirc ing the plunger rm andcontaining a sealing ring I'II having sealing and sliding contact withthe outer peripheral surface of the plunger for preventing leakage offluid under pressure from a chamber I12 to'achamber I13. the latterchamber being open to the atmosphere through a port I'M. A wall Iseparates chamber I68 from chamber I12 and the s em I69 extends throughan opening in this wall. the wall being rovided, in chamber I68, with aseat around said opening for engagement by the valve 67. A spring I76 inchamber I68 acts on the supp y valve I6! for urging it into contact withits seat. The supply valve I61, stem I69 and plunger I'III are providedwith an axial bore which is open at one end to chamber I68 and which isopen through a valve seat at the opposite end to chamber I'I3 whichcontains a release valve I'I'I arranged to cooperate with said seat forcontrolling the release of fluid under pressure from chamber I65 tochamber I13. The release valve I i is carried by a stem I78 which isdisposed directly below the axis of rock shaft I34.

The shaft I34 is provided with a cam I19 arranged to cont'act therelease valve stem I18. The cam H9 is so designed as to efi ct movementof valve I'I'I into contact with its seat and-to then act throughplungerI'll] and-stem 1'69 tomove tween and including Stop and Full steam?positions in the portion I42 of the slot.

Chamber I72 is arranged to be constantly supe plied with fluidunder-pressure from a fluid pres:- sure supply pipe- I80 while thelocomotive isin use. Chamber I68 is connected to pipe iii-which leads tospring chamber 56 in the forward throttle adjusting motor' IB. It willthus be seen that-with the operators control lever I37 in any positionbetween and including the "Stop and Full steam positions in the portionI42 of the slot, which provides for control of the forward throttleadjusting motor 40, the spring chamber 56 "in said adjusting motor willbe open to atmosphere .to provide for operation-of saidmotor byfluidunder pressure supplied to chamber 53 for controlling the steamsupply to the forward turbine 9, while in all other positions of saidlever, fluid under pressure will be supplied to spring chamber in theforward throttle adjusting motor to insure operat on thereof to cut-offthe supply of. steam to the forward'turbine 9:

The reverse steam cut-off valve device I166 is structurally identical tothe forward steam cutoh" valve device I and comprises a supply valve I81contained in a chamber I82 which is connected. to pipe 69 leading to thereverse throttle adjusting motor II, said valve being arrangedto controlthe supply of fluid under pressure from a chamber, I83 to chamber I82,the chamber I83 being constantly supplied with flu'd under pressure fromthe supply pipe I89 by way of chamber H2; The reverse steam cut-oh valvedevice further comprises a release valve I84 and an operating stem I85arranged to cooperate with a cam I86 on the rock shaft I34. The cam Ifltis formed just the reverse of cam I'IS so that with the operators'control lever in the reverse speed control zone, that is to say, in andbetween the Stop and Full steam positions in the portion M3 of the slot,the spring chamber 55 in the reverse throttle adjusting motor 4| w ll beopen to atmosphere to provide for adjustment of said motor by thepressure of fluid in chamber 53, while in all other positions of theoperators control lever the reverse steam cut-elf valve device IE6 willact to supply fluid under pressure to spring chamber 56 in the reversethrottle adjusting motor II to insure operat on thereof to cut-off thesupply of steam to the reverse turbine I2.

The forward and reverse cut-off valve devices I65 and I 66 will thus actto ensure the cutting off of'steam to both turbines when the controll nglever is in the central portion I II of the slot, and will ensure thatthe supply of steam to the reverse turbine I2 will be cut-off when theopera.- tors control lever is pos tioned for supplying steam 'to theforward turbine Q and will ensure that steam will be cut-off to theforward turbine when the operators controllever is positioned forsupplying steam to the reverse turbine.

The throttle adjusting motor selector valve portion I32 of the operatorscontrol valve device comprises a forward selector valve device III? forcontrolling communication between pipe 64 from the forward throttleadjusting motor 40 and a passage I88, and also comprises a reverseselector .735 valve device: 189: for controlling communication betweensaid passage and pipe 65 leading to the reverse throttle adjusting motor9|, the passage I88 leading to a self-lapping speed control valve deviceI90 also forming a part of the operators control valve device I291.

The forward selector valve device I81 comprises a plunger I9I which isslidably mounted in a suitable bore in the casing and which has at oneside a chamber I92 connected to passage I88, and which has at itsopposite side a chamber I93 which is open to atmosphere through apassage I94, a chamber I95, and an insect excluding device I96. Theplunger l9I is connected by a stem I91 to a fluid pressure supply valveI98 which is contained in a chamber I99, said stem extending through anopening in a wall 200 separating said chambers. In chamber I99 the wall290 is provided with a seat which extends around the opening therein forengagement by the supply valve I98. A spring I in chamber I99 acts onthe valve I98 for urging the valve to its closed position as shown inthe drawings.

The valve I99, stem I 91 and plunger I9I are provided with an axial bore202 open at one end to chamber I99 and at the opposite end to chamberI93. In chamber I93 the plunger I9! is provided with a seat whichextends around the bore 202 for engagement by a release valve 203. L0-cated above the release valve 299 is a plunger 204 which is slidablymounted in the casing in coaxial relation with said valve and withplunger I9I The plunger 204 is subject on its lower face to the pressureof fluid in chamber I93 plus the pressure of a spring 205, and is openat its upper face to chamber 296.

When fluid under pressure is supplied to chamber 206, in a manner whichwill be later described, the plunger 204 will move against the opposingforce of spring 205 and seat the release valve 203 against the plunger I9| for closing communication between chamber I99 and chamber I93.Plunger 204 when further moved by fluid pressure in chamber 206 will actthrough the release valve 203 and plunger I9I to unseat the supply valveI98 so as to allow fluid under pressure to flow from chamber I92 tochamber I99 and thence through pipe 64 to diaphragm chamber 82 in theforward throttle adjusting motor 40. Upon release of fluid underpressure from chamber 206 the spring 205 will act to return plunger 209to the position in which it is shown in the drawings to allow theclosing of the supply valve I98 by spring MI and the opening of therelease valve 203 by the pressure of fluid effective in bore 202 so asto release fluid under pressure from chamber 62 in the forward throttleadjusting motor past said release valve to atmosphere.

The reverse throttle selector valve device I89 is structurally identicalto the forward throttle selector valve device I8 and briefly described,comprises a supply valve 20'! for controlling flow of fluid underpressure from a chamber 208, which is open through chamber I92 topassage I98, to a chamber 209 which is connected to pipe leading todiaphragm chamber 62 in the reverse throttle adjusting motor tI. Thereverse throttle selector valve device further comprises a release valve2IIl which is contained in chamber I95, and which is for the purpose ofreleasing fluid under pressure from the reverse throttle adjusting motor4| by way of chamber 209. The device also comprises a plunger 2 which isarranged to operate in response to the supply of fluid under pressure toa chamber 2I2 to close the release valve 2I0 and open the supply valve201; Upon the release of fluid pressure from chamber 2I2 a spring 2I3will return the plunger 2 to the position in which it is shown in thedrawings to permit the closing of the supply valve 201 by a. spring 2Mand the opening of the release valve 2I0 by the pressure of fluid fromchamber 209, so as to thereby open pipe 65 and diaphragm chamber 62 inthe reverse throttle adjusting motor M to atmosphere.

The plunger chamber 296 is connected to a passage 2I5, and the plungerchamber 2 I 2 is connected to a passage 2I6. The passages M5 and 2I6lead respectively to forward and reverse directional control valvedevices 2H and 2I8 in a direction selector portion 2!!! of the operatorscontrol valve device I29.

The forward directional control valve device 2II comprises a plunger 220which is slidably mounted in a bore in the casing and which is connectedby a stem 22I to a supply valve 222 contained in a chamber 223. The stem22I extends through a chamber 229 formed at one side of plunger 220 andalso through a bore provided in a wall 225 which separates said chamberfrom chamber 223, said wall being provided around said bore in chamber223, with a seat for engagement by the supply valve 222. A spring 226 inchamber 223 acts on the supply valve 222 for urging it to its seat. Thesupply valve 222, stem 22I and plunger 220 are provided with an axialbore open at one end to chamber 223 and open at the opposite end througha valve seat, to a chamber 221 which is open to atmosphere through aport 228. A release valve 229 contained in chamber 221 is provided toengage a seat on the end of plunger 220 for closing communicationthrough the bore in said plunger. Chamber 224 is open to a passage 230which is adapted to be constantly supplied with fluid under pressurefrom the fluid pressure supply pipe I80. Chamber 223 is connected topassage 2I5 leading to plunger chamber 206 in the forward throttleselector valve device I81. The release valve 229 is carried by a stem23I which is slidably mounted in the casing and which extends beyond anexterior surface thereof.

The reverse directional control valve device 2I8 is structurallyidentical to the forward directional control valve device 2" and brieflydescribed, comprises a supply valve 232 which is contained in a chamber233 and. which is arranged to be seated by the pressure of a spring 234.The supply valve is connected by a stem 235 which extends through achamber 236 to a plunger 231 at the outer face of which plunger is achamber 238 open to atmosphere through a port 239. A release valve 240which is contained in chamber 238 is arranged to cooperate with a seatprovided on the adjacent end of plunger 23! for controlling the releaseof fluid under pressure from chamber 233 to atmosphere by way of chamber238. The release valve 240 has a stem 24I extending through a bore inthe casing and beyond an exterior surface thereof. The chamber 236 issupplied with fluid under pressure from pipe I by way of passage 230 andchamber 224. Chamber 233 is connected to passage 2I6 leading to plungerchamber 2| 2 in the reverse throttle selector valve device I89.

The two release valve stems 23I and MI are arranged in spaced parallelrelation with respect to each other and to the axis of the plunger I35which is mounted to slide in rock shaft I34. The release valve stem 23Iis engaged by one end of accre ed a lever 242 which, substantiallymidway between its ends, is fulcrumed on a pin 243 mounted in a bracket244 projecting from the casing of the device. The opposite end of lever242 is disposed in a recess 245 provided in plunger I35, so thatlongitudinal movement of said plunger will rock the lever 2 32 about thefulcrum pin 243. The release valve stem MI is engaged by a lever 246substantially midwayof its length. One end of lever 246 is fulcrumed ona pin 24! provided in a brack et 248 projecting from the casing, Whilethe opposite end is disposed in a recess 249 provided in the plunger I35so as to move with the plunger upon longitudinal movement thereof.

With the operators control lever I31 in Neutral position, as shown inFigs. 1 and 3 the levers 222 and 248 will be positioned to permit theopening of the release valves 229 and 240, respectively, and the closingof the supply valves 2'22 and 232, respectively, so as to therebyrelease fluid under pressure from plunger chambers 206 and 2I2 in theforward and reverse selector valve devices I81 and I89. The releasevalves 203 and 2 I 0 in the later devices will therefore be open and thesupply valves I 98 and 201 will be closed so that diaphragm chambers 62in the forward and reverse throttle adjusting motors and M will beopened to atmosphere. Thus with the operators control lever in Neutralposition the power piston chambers 53' in the forward and reversethrottle adjusting motors 40 and M, will also be open to atmosphere topermit the power pistons in said motors to occupy their steam cut offpositions as shown in Fig. 11 to thereby cut-off the supply of steam tothe forward and reverse turbine 9 and I2, respectively.

The operators control lever I31 when moved to the position designated bythe legend Forward selection in Fig. 3, will move the plunger I35longitudinally in the direction of the lefthand to thereby actuate thelever 242 to close the release valve 229 and open the supply valve 222in the forward directional control valve device 2I'I. Thus, in thisposition of the operators control lever, fluid under pressure will besupplied from the supply pipe I80 to passage -2I5 and thence to plungerchamber 206 in the forward selector valve device I81 to thereby actuatesaid device to establish communication between passage I88 and pipe 64leading to the forward in order that said motor will operate to cut-offthe supply of steam to the reverse turbine I2.

Th condition just described of the forward and reverse directionalcontrol valve devices 2!! and 2I8 is obtained in the Forward selectionposition of the operators control lever and is then maintained as longas said lever is at this side of Neutral position and consequentlyduring the adjustment of the lever in the portion Hi2 of the lever guideslot. Now if the operators control lever I3! is moved from Neutralposition to the position indicated by the legend Reverse selection inFig. 3, the

plunger G35 will be moved longitudinally in the direction of theright-hand as viewed in Fig; 1

shown in Fig, 1. sure will be supplied from passage 230 to passage isandthe lever as it is thus moved will actuate lever 246 to close therelease valve 238 and open the supply valve 232 in the reversedirectional control valve device 2 I8, while allowing the parts or theforward directional control valve device 2H to remain in the position inwhich they are As a result, fluid under pres- 2i6 leading to plungerchamber 2l2 in the reverse selector valve device I853. The later devicewill then operate to open communication between pipe we and pipe 65leading to diaphragm chamber 62 in the reverse throttle adjusting motorat. Under this condition the parts of the forward selector valve deviceI81 will remain in the position in which they are shown in the drawingsfor opening pipe 64 and thereby diaphragm chamber 62 in th forwardthrottle adjusting motor 30 to atmosphere. This condition of the forwardand reverse directional control valve devices 241 and M8 will bemaintained as long as the operators control lever is at the left-handside of Neutral position, as viewed in Fig. 3, and therefor durinadjustmerit of said lever in the portion I50 of the guide slot.

The self-lapping valve device I 90 may be of any suitable type arrangedto supply fluid at various degrees of pressure from a chosen minimumpressure to a certain maximum degree. For illustration, the self-lappingvalve device I90 may be like that fully shown and described in my Patent2,381,222 issued August 7, 1945, and

briefly, comprises a control plunger 250 and valve means (not shown)controlled by said plunger and operable to provide in passage I88 fluidat a pressure proportional to the degree of displacement of said plungerfrom a normal position, such as shown in Fig. 1, and operable in thenormal position to reduce th pressure in passage I88 to a chosen minimumpressure such as eight pounds. Fluid under pressure for supply topassage I88 by operation of the selflapping control valve device isadmitted to said device through. passage 230 which is connected to thefluid pressure supply pipe I before mentioned. For controllindisplacement of plunger 250 from its normal position as shown in Fig. 1,the rock shaft I3 2 is provided with a cam 2 5I havin two identical butreversel arranged and spaced cam portions 252 and 253 on the peri heralsurface of the cam. The peripheral surface of the cam is operativelyconnectedto plunger 250 through a ball-like end 254 of an arm 235, theopposite end of which arm is mounted to rock about a fulcrum 256provided in the casing.

With the operators control lever I3! in "N eutral position or in eitherof the Forward or Reverse selection positions, the cam 25I provides formovement of the plunger 250 to its outermost or normal position in whichthe selflapping valve device l0!) will operate to provide fluid at aminimum pressure of eight pounds. to the control passage I83. Movementof the operators control lever to either Stop position is adapted tocause operation of cam- 25I to effect operation of the self-lappingvalve device I90 to supply fluid at a certain greater pressure such asten pounds to passage I80, which pressure, effective in diaphragmchamber 62 of the forward or reverse throttle adjusting motor 40 or 4|in a manner which will be later described,

will actuate said motor and thereby the respective 75- throttle valve 34or 35 to supply the hereinbe- -to atmosphere. tor valve devices I81 andI89 will thus be con- "fore mentioned minimum amount of steam to therespective turbine 9 or I2.

The operators control lever when moved in the portion I42 of the slotfrom the Stop posi- :tion to the Full steam position will causeoperation of cam 25I to effect displacement of plunger 250 into theself-lapping valve device I90 an amount proportional to the extent ofmovement away from Stop position to thereby provide in passage I88 fluidat a proportional pressure. A maximum pressure of fluid such assixty-five pounds will be obtained in passage I88 8 upon movement of theoperator's control lever in portion I42 of the slot to the Full steamposition. Adjustment of the operators control lever in the reversdirection in the portion I42 of the slot will cause the pressure inpassage I88 to re- .duce in proportion to the distance the lever is outof the Stop position, while the return of said lever to the Forwardselection position 7 will cause operation of the self-lapping valve de-*vice to reduce the pressure of fluid in passage I88 to the minimumpressure above mentioned.

In a like manner the pressure of fluid in passage I 88 will be varied inaccordance with adjustment of the operators control lever I31 in theportion I 43 of the slot, as will be apparent.

Pressure chamber 28 in the pneumatic clutch control cylinder 22 isconnected through pipe 29 to passage 2; in the operator's control valvedevice for control by operation of the reverse directional control valvedevice 2 I8. I

The operation of the apparatus as so far described will now be setforth.

Let it be initially assumed that the operators control lever I3! is inNeutral postion effecting operation of the forward and reversedirectional control valve devices 2H and 2I8 to Open the .plungerchambers 206 and 2I2 in the forward and reverse selector valve devices I81 and I89 The forward and reverse selecditioned to open pipes 64 and 65and diaphragm chambers 62 in the forward and reverse throttle ,adjustingmotors 40 and 4| to the atmosphere j to cause a complete release offluid under pressure from the power piston chambers 53 therein.

The power pistons 50 in the forward and reverse throttle adjustingmotors will therefore be positioned as shown in Fig. 11,'under theaction of springs 58, so that, the throttle valves 34 and 35 are inposition to cut-oil the supply of steam to the forward and reverseturbines 9 and I2, so

' that the locomotive may be stopped.

Further, with the operators control lever I31 fin Neutral position theforward and reverse steam cut-off valve devices I55 and I66 will beconditioned as shown in Fig. 1 for supplying fluid under pressure fromthe supply pipe I80 to pipes 59 and 60 leading to spring chambers 56 andto the ensuring piston chamber I28 in the forward and reverse throttleadjusting motors 40 and II, respectively, to ensure that the pistons 50in said motors will be occupying their steam cut-off positions as shownin Fig. 11.

Moreover with the parts of the reverse directional control valve device2I8 in the position as shown in Fig. 1, pressure chamber 28 in theclutch control cylinder 22 will be open to atmosphere by way of pipe 29and passage 2 I 6 to permit operation of piston 23 by spring 30 todisengage the movable element 2| of the clutch from the fixed element 20so as to disconnect the reverse turbine I2 from the forward turbinedrive shaft 8.

Let it now be assumed that forward movement of the locomotive isdesired. To accomplish this, the operator will move lever I31 fromNeutral position first to the "Forward selection position, to therebyactuate the forward directional control valve device 2I'I to supplyfluid under pressure to passage 2I5 and thence to plunger chamber 206 tooperate the forward selector valve device I81 to open communicationbetween passage I88 from the self-lapping valve device I90 and pipe 64leading to the forward throttle control motor 49.

The operator will then move the control lever I31 from the Forwardselection position to the Stop position in the portion I42 of the slot.The lever as it is thus moved to "Stop position will actuate the forwardsteam cut-01f valve device I65 to release fluid under pressure fromspring chamber 56 and the ensuring piston chamber I28 to permit closureof valve I20 in the forward throttle adjusting motor 40 and at the sametime will actuate the self-lapping valve device I90 to supply fluid topassage I 88 and through the forward selector valve device I87 to pipe64 and thence to the diaphragm chamber 62 in the forward throttlecontrol motor 40 at the pressure, such as ten pounds, sufllcient tocause operation of said motor and thereby of the throttle valve 34 tosupply steam to the forward turbine 9 in an amount insuflicient to causeoperation of the turbine but which will provide for heating thereof ashereinbefore described.

Movement of the lever I 31 past Stop" position in the direction of Fullsteam position in portion I42 of the slot will then cause operation ofthe self-lapping valve device I90 and thereby of the forward throttleadjusting motor 40 and throttle valve 34 to increase the supply of steamto the forward turbine 9 in an amount proportional to the extent ofmovement of the lever away from Stop position, to thereby causeoperation of the forward turbine to drive the locomotive axle I and thelocomotive at a proportional speed.

Further movement of the operators control lever in the direction of Fullsteam position in'the portion I42 of the slot will provide acorresponding increase in the amount of steam suptive while movement ofsaid lever to Full steam position will cause operation of motor 40 andthrottle valve 34 to provide a maximum amount of steam to the forwardturbine 9 to obtain a maximum forward speed or output of power from 'theturbine for driving the locomotive in a forward direction.

If the operator should desire to reduce the speed of the locomotive hemay move the control lever I3! in the direction of Stop position and theforward throttle adjusting motor 40 will operate to adjust the throttlevalve 34 to correspondingly reduce the supply of steam to the forwardturbine 9. Return of lever I31 to Stop position in the portion I42 ofthe slot will reduce the supply of steam to the forward turbine to theminimum amount which is insufficient for causing operation of theturbine as before mentioned.

It will thus be seen that by suitable adjustment of the operatorscontrol lever in the portion I42 of the slot between the Stop and Fullsteam positions any desired degree of speed or output of power from theturbine 9 may be obtained for propelling the locomotive in a forwarddirection, it being noted that during this opera- 2'1 tion of theforward turbine 9, the reverse tur- Dine I2 is maintained non-operativeand disconnected from the locomotive axle since the parts of the reversedirectional control valve device 218, reverse selector valve device I89,reverse steam cut-01f valve device I 66 and thereby the reverse throttleadjusting motor II remain in the positions in which they are shown inthe drawings with the operators control lever at the Forward selectionside of Neutral position.

In order to provide for the stopping of the comotive from movement in aforward direction, the operator need only return the lever to Stop"position adjacent the Forward selection position to thereby render theforward turbine 9 non-operable, as will be apparent.

If the operator desires to move the locomotive in the reverse directionhe will move the control lever I3! to the Reverse selection position forthereby operating the reverse directional control valve device 2 I8 tosupply fluid under pressure to passage 2I6 and thence to plunger chamber2I2 in the reverse throttle selector valve device I89 for actuating thelatter device to connect pipe '65 from the reverse throttle adjustingmotor 4' I to passage I88 leading to the speed control valve device I95. Fluid under pressure supplied to passage ZIE will also flow throughpipe 29 to the clutch control cylinder 22 to actuate piston 23 thereinto move clutch element 2 I into driving engagement with element forconnecting the reverse turbine I2 to drive shaft 8.

The operator may now move lever I31 from the Reverse selection positionto Stop position in the portion I43 of the guide slot and this movementwill effect operation of the reverse steam cut-off valve device I66 toopen spring chamber 56 and piston chamber I28 to atmosphere and topermit closure of valve I20 in the reverse throttle adjusting motor 4|and at the same time will cause operation of the self-lapping valvedevice I9ll to supply fluid to passage I88 and through the reverseselector valve device I89 to diaphragm :chamber 62 in the reversethrottle adjusting motor M at a. pressure to cause operation of saidmotor and thereby of the throttle valve 35 to supply steam to thereverse turbine I2 at a pressure insufiicient to cause operation of saidturbine but sufiicient for heating same as before described. Suitableadjustment of lever I37 in the portion I43 of the slot between the Stopand Full steam positions will then cause operation of the reversethrottle adjusting motor M and thereby of the reverse throttle valvedevice 35 to cause operation of the reverse turbine I2 at any desiredspeed or degree of power output and the locomotive may be stopped uponreturn of the operators lever to the Stop position for rendering thereverse turbine nonoperative, as will be apparent from the previousdescription.

It is however desired to point out that with the operators control leverat the Reverse selection side of Neutral position, the parts of theforward directional control valve device 2I'I, the forward steam cut-offvalve device I65, the forward selector valve device I8! and the forwardthrottle adjusting motor 4B will remain in the positions in which theyare shown in the drawings rendering the forward turbine 9"non-"operative during'operation of the reverse turbine I2 to propel thelocomotive in reverse. However, since the forward turbine 9. is atall'times connected to the locomotive axle I, its rotor (not avera eshown) will turn as the locomotive is driven by the reverse turbine I 2.

In pipe 64 leading to the forward throttle adjusting motor 40 is a choke251 and a check valve 258 in a communication by-passing said choke, saidcheck valve being so arranged as to render said choke efiective torestrict the rate of flow of fluid under pressure to said motor forlimiting, to a desired degree, the rate of acceleration of thelocomotive in a forward direction. The communication containing checkvalve 258 permits a more rapid rate of release of fluid under pressurefrom the forward throttle adj-usting motor to obtain a rapid cut-off ofthe supply of steam to the forward turbine 9. For the same reasons achoke 259 and by-pass communication containing a check valve 250 areprovided in pipe 65 leading to the reverse throttle adjusting motor 4|.

It is desired that the turbines 9 and I2 never be used for braking thelocomotive. In other words, with the locomotive running backward steammust not be supplied to the forward turbine 9 which would tend to causeoperation of said turbine to oppose movement of the locomotive.Likewise, with the locomotive moving forwardly, steam must not besupplied to the reverse turbine I2 at a, time when said turbine would beconnected to the locomotive axle.

In order to thus prevent the supply of steam to the reverse turbine I2when the locomotive is moving forwardly, or to the forward turbine whenthe locomotive is moving rearwardly it is therefore essential to preventmovement of the operators control lever I3! into the portion I43 of itsguide slot under the former condition, or into the portion I42 of saidslot under the latter condition but it is desired that under either ofthese conditions the lever be capable of movement to Neutral position.

For thus controlling movement of the operators control lever I31, a pin26'I, secured at one end in the body portion I29 of the operatorscontrol device, projects upwardly into the cover I33, and pivo'tallymounted on the other end of this pin within said cover is a rockable andshiftable interlock member or stop 262. The member 262 has a slot 263through which the pin 26I extends and which provides for movement of themember in a direction either toward or away from the operators controllever I31. At one end of member 262 is a finger 264 which, with saidmember in the position in which it is shown in Fig. 8 and with thecontrol lever I31 in its Neutral position, is movable past one side ofsaid lever to a position for holding said lever against movement fromNeutral position to the Reverse selection position and thus into portionI43 of the slot. With the member 262 shifted to the right on pin 26I(Fig. 8) an amount governed by the length of slot 263, the flnger'264will be so disposed as to move past the right-hand side of the operatorscontrol lever I31 when in Neutral position to prevent movement of theoperators control lever to the Forward selection position and into theportion I 4-2 stop detecting device 28!.

angles to the axis of the axle l.

control lever for blocking same against movement to the Forwardselection position, said lever may still be moved at will, from Neutralposition in the direction of the Reverse selection position.

A bell crank 265 is rockably mounted on a pin 266 disposed under theinterlock member 262, and this crank has one arm 261, the end of whichis disposed in a slot 268 provided in the end of the member opposite thefinger 264. Rocking of the bell crank 265 will rock member 262 formoving the finger 284 in the direction toward or away from the path ofmovement of the operators control lever l31. The bell crank 265 hasanother arm 269, and between the end of this arm and the body of thecontrol device is interposed aspring 218 under pressure. This arm 269 isso arranged that spring 218 will urge the bell crank 265 in a directionto rock member 262 in a counter-clockwise direction, as viewed in Fig.8, for moving the finger 264 into the path of movement of the operatorscontrol lever I31. The bell crank 265 has a third arm 21! the end ofwhich engages a plunger 212. The opposite end of plunger 212 terminatesin a follower 213 engaging one side of a flexible diaphragm 214. Thefollower 213 is contained in a chamber 215 which is open to atmospherethrough a vent 216. At the opposite side of diaphragm 214 is a pressurechamber 211 which is connected by a passage 218 (Figs. 1 and '7) to apipe 219 leading to a timing reservoir 288 and to a zero speed or fullWhen fluid is provided through pipe 219 to chamber 211 below diaphragm214 in a manner which will be later described, at a suflicient pressureto rock the bell crank 265 against the opposing pressure of spring 218,the interlock member 262 will move finger 264 out of the path ofmovement of the operators control lever I31 while, when the pressure offluid in said chamber is of a lower degree, spring 218 will act tooperate said member to move finger 264 into the path of movement of theoperators control lever as before mentioned.

The zero speed detecting device 28| is adapted to be associated with anyrotatable part of the locomotive which turns upon movement of thelocomotive along its rails. In Fig. 2 the device is shown, forillustration only, associated with the locomotive drive axle l.

The zero speed detecting device 28! comprises upper and lower casingsections 282 and 283 and a flexible diaphragm 284 which is clampedaround its marginal edge between the adjacent ends of said casingsections. The opposite end of the casing section 283 has a bore linedwith a bushing 285, the axis of said bushing being arranged in coaxialrelation with said diaphragm and at right Below the diaphragm 284 is anon-pressure chamber 286 containing a diaphragm follower 281 engagingthe adjacent face of the diaphragm. At the opposite face of thediaphragm is a pressure chamber 288 containing a follower ring 289engaging said opposite face. bushing 285 and extending into thenon-pressure chamber 286 has a reduced portion 29l extending through thefollower 281, the diaphragm 284 and follower ring 289 to a point beyondsaid ring, and

-The casing is provided with a stop shoulder 293 which is arranged to beengaged by follower 281 for limiting deflection of the diaphragm 284.

A plunger 298 slidably mounted in in the direction of the locomotiveaxle I. At the opposite side of the diaphragm is a stop shoulder 294which is provided for contact with ring 289 to limit deflection of thediaphragm in the opposite direction to a normal position in which it isshown in the drawing. The contact between ring 289 and shoulder 294 ismerely for stopping purposes and when such contact is effected, fluidunder pressure may flow from one side of the shoulder 294 to the otherso that chamber 288 constitutes space at both sides of said shoulder asindicated by the two lead lines from numeral 288.

A spring 295 encircling plunger 298 within the non-pressure chamber 286bears at one end on the inner end of bushing 285, while the opposite endof said spring bears against the diaphragm follower 281. This spring isunder pressure so as to urge the parts of the device to the position inwhich they are shown in the drawings and for opposing movement of saidparts out of this position by pressure of fluid in chamber 288. It willbe noted that chamber 288 is open through pipe 218 to chamber 211 belowdiaphragm 214 in the operators control device, and it is desired to herepoint out that the pressure of spring 295 on diaphragm 284 will allowmovement of said diaphragm by fluid in chamber 288 at a lower pressurethan required to move diaphragm 214 against its opposing spring 218.

Below the lower casing section 283 the plunger 298 is cut away for abouttwo-thirds of its diameter to provide at one side an arm 298 whichterminates a certain distance above the locomotive axle I. In the end ofthis arm is secured a. fulcrum screw 291 arranged with its axle parallelto that of the locomotive axle l, and pivotally mounted on this screwand thus carried by and movable with the arm 298 is a collapsible strut298. Above the fulcrum screw 291 the strut 298 has an ear 299 to whichis hooked one end of a tension spring 388, the opposite end of whichspring is connected to a pin 38| secured in the plunger 298. The spring388 is under tension so as to constantly bias the strut 298 in thedirection toward the position in which it is shown in Figs. 12 and 13and to oppose rocking movement of said strut on fulcrum pin 291 ineither direction out of this position. The opposite end of the strut 298is arcuate in form and secured thereto is a friction shoe 382 made ofany suitable material, such as a brake lining, for contacting thelocomotive axle l. A guide pin 383 carried by plunger 298 extends into aslot 384 provided longitudinally of bushing 285, the pin cooperatingwith the bushing for maintaining the fulcrum pin 291 parallel to thelocomotive axle l.

The reduced portion 29! of plunger 290 is provided with a counter bore385 open to the end disposed in chamber 288, and the nut 292 is providedwith a bore through its end, which latter bore is of smaller diameterthan bore 385 so as to provide a stop shoulder 386 overlying the openend of bore 385. A plunger 381 is mounted to slide through the openingin the end of nut 292 and is provided within bore 385 with an enlargedhead 388 which is adapted to engage shoulder 386 for limiting movementof said plunger outwardly of bore 385. A coil spring 389 disposed inbore 385 bears at one end on the closed end wall of said bore, while itsopposite end bears against the plunger head 388, the spring beingprovided for the purpose of urging the plunger outwardly through the nut292, such outward movement being limited by contact between the head 388and the shoulder 306. on said nut. On the. opposite end. of plunger 38:1a valve 3W which is arranged to cooperate with a seat provided on oneend, of a bushing 3H. This. bushing is secured in. a. bore in a wall 3l2separating. chamber 288- from a. chamber 3l3 which is inconstant-communication with the atmosphere through an insect excludingdevice 3 l4.

With the parts of the zero speed detecting device in the position asshown in Fig. 12, as defined by the contact between. the follower ring289 and stop shoulder 294, the valve 3lll will be seated by Spring 303,and the plunger head 303 will be spaced from step shoulder 333 adistance greater than the distance between the locomotive axle I andfriction shoe 362, so that, with the diaphragm 284 deflected in adirection away from stop shoulder 294 to a positionv in which the shoe302 will just contact said axle, the valve. 3H3 will. be allowed toremain in contact with. its seat under action of spring 339. If the axlel is rtating in either direction when the shoe 302 is moved into contacttherewith, the friction between said shoe and axle will cause the strut298 to rock on fulcrum pin 231 to a position in which one edge or theother of said strut will move past the axis of plunger 280, at whichtime pressure of fluid efiective in chamber 283 on dia phragm 295, in amanner which will be later described, will cause said strut. to rock onpin 29! to permit the diaphragm to move further in the direction of theaxle and to the position defined by contact between follower 28'! andstop shou der 293. Upon this movement, the shoulder 385 on the nut 292will engage the plunger head 338 and pull the valve 310 out of contactwith its seat.

A control valve device 3!.5 is provided for supplying fluid underpressure to and releasing fluid under pressure from pipe 219 and thus toand from the timing reservoir 28B, diaphragm chamber 21'! in theoperators control valve device,

and chamber 283 in the zero speed detecting device 28!.

The control valve device 3l5 comprises a casing having a chamber 3H5constantly supplied with fluid under pressure from the fluid pressuresupply pipe I80. The casing also has a chamber 3 containing a fluidpressure supply valve 3l8 arranged to control the supply of fluid underpressure from chamber 3IB to chamber 3 l l and thence through a choke mto pipe 279 above mentioned. A communication including a check valve320v by-passes the choke 3| 9, said check valve being so .arranged as torender said choke effective to restrict the rate of flow of fluid underpressure to pipe 279 but ineffective to limit outflow of fluid pressurefrom said pipe, the communication controlled by said check valveproviding for a relatively greater rate of such outflow.

A plunger 32l is slidably mounted in a bore in the casing of the controlvalve device M in coaxial relation to the supply valve 3l8 said plungerbeing subject on one end to pressure of fluid in chamber 3lT.. A sealingring 322 disposed in an. annular recess encircling the plunger 32! hassealing and sliding contact with the peripheral surface of said plungerto prevent leakage of fluid under pressure from chamber-3i! past theplunger to a chamber 3223 which is open toatmosphere through a passage324. The plunger 32l is operativelyconnected to one end of a diaphragm.follower 325, the opposite end of which contacts the adjacent face of aflexible dia- 26 phragm: 326' which is: clamped around its marginal,edge in the casing. The diaphragm 326 is subject on one: side toatmospheric pressureiin chamber 323 and at the opposite side there is.provided a pressure chamber 321 which is con.- nected through a pipe 328to th side outlet of; a. double check valve device 329. ends of thedouble chack valve device are respec-i. tively connected to passages 2I5and Elli in, the; operators control valve device. This: double checkdevice may be; of any suitable structure: adapted to operate upon thesupply of fluid underpressure; to passage 2 l-5, with passage 213ventedi in the manner before described, to opencom-- munication betweenpassage 2| 5 and: pipe 328; and. to close communication between saidpipe; andpassage 2E5, while upon the supply of fluid to passage 215,with passage 2I5 vented, the

double check valve will connect pipe 328; to past.

sage ZlE- and disconnect said pipe from passage; 2J5. 7

The: plunger 32 Iv is provided with an axial. bore open through. itslower end to chamber 311 and; within this bore there: is a valve. seatand, a. re.- lease valve 330' arranged. to cooperate. with. said. seal;for controlling communication, between. chamber 311 and the atmosphericchamber 323.; This. bore. also contains a coil; spring 331 which isunder pressure and which acts on the: release valve 330 for urging thevalve to its seated on closed position as shown in the drawings. Therelease valve 330 has a fluted stem 332 which exa. tends through thebore in the plunger-in the, direction of chamber 31:! for contact with astem, 333 extending from the supply valve 3 l8. A precompressed spring333 is disposed in chamber 3-23. This spring encirclesplunger 32! andtwo. oppositely arranged springseats 33.5 and 336. which. arerespectively engaged by the opposite ends of said spring. The springseat 335. is. con nected to the plunger 32l by means of a, suit ableconnecting member 337, while the spring; seat 336, is provided at theend adjacent. spring; seat 335 with, an inwardly extending collar 3.38overlying a collar 333 on the plunger, but, nor-l mally supported by thecasing out of contact with said collar.

With chamber 337 open to atmosphere by way of either passage 2l5 or 213,the pressure of spring 334 will. act to move the plunger. 32| t0. theposition in which it is shown in the drawing which position is definedby contact between the; diaphragm 326 and the casing. In this positionthe spring 331 is adapted to hold the release valve 33!) seatedv and toposition the stem 3.32 of said release valve so as toallow pressure offluid. elrective in chamber 316 to open the supply valve M8 forpermitting flow of fluid under pressure from said chamber to chamber31?. Upon. supply of fluid to chamber 327 at a pressure suificientv todeflect the diaphragm 323 against the opposing pressure of spring 333said diaphragm Will act to move the plunger 32! in the direction of thesupply valve 3H3 and such movement will be limited by contact betweenthe spring seat 335 and a stop shoulder 33! provided in the casing. Uponsuch movement of plunger 32 l, the spring 33| will hold the releasevalve 330 seated until the supply valve 353 is closed and further movement of said plunger will then be relative-to the release valve 333which will be held against movement due to contact between stem 33.2 andstem 333 projecting from the supply valve 3H3. Thus this furthermovement will open the release valve 3.33 so as to release fluid underpressure. from The opposite chamber 3I1 to atmosphere by way of passage324.

In operation, let it be assumed that the operators control lever I31 isin the portion 142 of the guide slot causing movement of the locomotivein a forward direction. The forward directional control valve device 2I1will be conditioned to supply fluid under pressure to passage 2I5, whilepassage 2I6 will be open to the atmosphere through the reversedirectional control valve device 2I8. The fluid pressure thus effectivein passage 2I5 will also be effective through the double check valvedevice 329 in diaphragm chamber 321 of the control valve device 3I5, sothat the diaphragm 326 will be deflected to the position for closing thesupply valve 3I8 and opening the release valve 330. With the releasevalve 330 thus open pipe 219 and chamber 211 below the diaphragm 214 inthe operators control valve device will be open to atmosphere, as aresult of which spring 210 will be effective to hold the bell crank 265in the position in which it is shown in Fig. '7 and the interlock member262 will be positioned as shown in Fig. 8 with the finger 264 disposedin the path of movement of the operators control lever I31. With pipe219 open to atmosphere as just mentioned, diaphragm chamber 288 in thezero speed detecting device 28I will also be open to atmosphererendering spring 295 effective to hold the parts of said device in theposition as shown in Fig. 12 with the strut 298 out of contact with theaxle I.

Now let it be assumed that, with the locomotive running in a forwarddirection as just mentioned, the operator desires to reverse thedirection of movement of the locomotive. To accomplish this he will movethe control lever I31 out of the portion I42 of the slot to the adjacent"Stop position in order to cut off the supply of steam to the forwardturbine 9 so that the locomotive may be brought to a stop. He will thencontinue movement of the lever I31 through the "Forward selectionposition to Neutral wherein it will contact finger 264 of the interlockmember 262 which will then prevent further movement of the lever to theopposite side of Neutral position. With the operators'control lever thusmoved to Neutral" position, the forward directional control valve device2I1 will operate to release fluid under pressure from passage 2I5 andthereby from diaphragm chamber 321 in the control valve device 3| 5.Spring 334 in the control valve device 3I5 will then move the diaphragm326 to the position in which it is shown in Fig. 1, and as a result, therelease valve 330 will be closed and the supply valve 3I8 will bepermitted to open under the pressure of fluid effective in chamber 8I6.Fluid under pressure will now flow from chamber 3I6 to chamber 3I1 andthence through choke 3I9 to pipe 219 and through said pipe to diaphragmchamber 211 in the operator's control valve device and also to thetiming reservoir 280 and to chamber 288 in the zero speed detectingdevice 28 I.

The pressure of fluid thus provided in chamber 288 on diaphragm 284 inthe zero speed detecting device will then gradually increase at a ratedetermined by the flow capacity of choke 3I9 until it becomes sufficientto overcome the opposing force of spring 295 whereupon the diaphragm 284will deflect downwardly or in the direction of the locomotive axle I outof the position in which it is shown in Fig. 12. After a slight degreeof movement of the diaphragm 284 away from stop shoulder 294, the shoe302 in the end of strut 298 will contact the locomotivewill act, throughthe medium of the plunger 301 I and plunger head 308, to unseat thevalve 3I0, whereupon fluid under pressure will be released from chamber288. The release capacity of the valve 3I0 so exceeds the supplycapacity of choke 3I9 that when said valve is opened the pressure offluid in chamber 288 will be suddenly reduced to a sufiiciently lowdegree to permit spring 295 to promptly return the parts of the zerospeed detecting device to the position as shown in Fig. 12, for closingvalve 3H3, whereupon the strut 298 will be returned to the position inwhich it is shown in Figs. 12 and 13 by the spring 300.

When the valve 3I0 in the zero speed detecting device is closed as justdescribed, the pressure of fluid in chamber 288 will again increase bythe continued supply through choke 3I9 to a sufficient degree to againoperate diaphragm 284 to move shoe 302 into contact with the axle I. Ifthe axle is still rotating the strut 298 will again collapse to permitthe pressure of fluid in chamber 288 to operate the diaphragm 284 foragain opening the valve 3|!) for releasing fluid under pressure fromchamber 288.

The zero speed detecting device will continue to operate as justdescribed as long as the axle I is turning in order to prevent thepressure of fluid increasing in diaphragm chamber 211 of the 284 againstfurther movement so that the valve 60 3I0 will remain seated. When thevalve 3I0 is thus held against opening, the pressure of fluid in chamber288 and in chamber 211 in the operators control valve device, will thenincrease to the higher or greater degree required to deflect diaphragm214, against the opposing force of spring 210. This deflection ofdiaphragm 214 will rock the bell crank 265 and in turn the interlockmember 262 in the direction for moving the finger 264 out of the path ofmovement of the operators control lever I31. The lever I31 may then bemoved from Neutral to its Reverse selection position and then into theportion I43 of its guide slot to cause operation of the reverse turbine9 to move the locomotive in the reverse direction.

It will now be seen that the zero speed detecting device 28I and theinterlock member 262 will prevent the operator from operating hiscontrol device to cause steam to be supplied to the re-' verse turbineI2 with the locomotive moving in a forward direction, so that saidturbine cannot act in the capacity of a brake.

In case the engine is moving rearwardly and the operator desires that itmove forwardly he 76 will move the lever I31 from whatever-position itmay occupy at the left-hand side of Neutral" position, as viewed in Fig.3, back to Neutral position where it will be stopped by finger 264 ofthe lock member 262 for reasons which will be apparent from the abovedescription. However, after the locomotive is brought to a complete stopfrom movement rearwardly, as detected by the zero speed detecting device28!, the finger 254 will be drawn out of the path of movement of leveri3! so that said lever may then be operated to cause steam to besupplied to the forward turbine 8 for moving the locomotive in a forwarddirection. Thus with the locomotive operating in a rearward direction,steam cannot be supplied to the forward turbine 9 until after thelocomotive is brought to a complete stop, so that said turbine cannotact in the capacity of a brake.

'It will be noted that the slots 253 and .268 in the interlock member262 permit shifting of said member longitudinally in order to permitmovement of the operator's control lever 131 to Neutral position fromeither side of Neutral position in order that the zero speed detectingdevice will be rendered operative for either direction of movement ofthe locomotive.

' It will also be noted that if the locomotive is running either in theforward or in the reverse direction and the operator moves the controllever 43? to Neutral position, at which time the interlock finger 264will act to prevent further movement of said lever, and the operatorthen desires to continue movement of the locomotive in the lastdirection of operation he may move the lever I31, without hesitation,back into the portion I42 or i 43 of the slot last employed, since theinterlock finger 254 has no control over such movement to continuerunning of the engine in the same direction.

In case the locomotive is stopped, and the operators control lever is inNeutral position, the zero speed interlock device will be conditioned bycontact of strut 298 with the locomotive axle i to permit such pressureincrease in chamber 211 on diaphragm 214 of the operators control valvedevice to move the interlock finger 264 out of the path of movement ofthe lever I31, so that without any delay the operator may move saidlever in either direction from Neutral" position to attain the desireddirection of movement of the locomotive.

After the finger 26 i is withdrawn from the path of movement of theoperators control lever l3? and said lever is moved out of Neutralposition to cause reverse movement of the locomotive as above described,it should be noted that fluid under pressure is supplied to diaphragmchamber 32! in the control valve device 315 which will effect operationof said device to open the release valve 338 for venting fluid underpressure from the timing reservoir 28B, chamber 288 in the zero speeddetecting device and diaphragm chamber 211 the operators control valvedevice, this venting occurring rapidly past the check valve 320. Theparts of the zero speed detecting device. will therefore return to theposition in which they are shown in Fig. 12 and finger 264 will promptlymove into the path of movement of lever i3! and then remain in this.position as long as the locomotive is being propelled in the selecteddirection It will therefore be apparent that if the locomotivev isstarted in one direction and the operator then suddenlytdecides to movethe locomotive in the. opposite direction, the finger 264'will be in thepath of. movement of lever l3! and prevent movement of said lever to theopposite side of Neutral position to obtain movement in the saidopposite direction until after the locomotive is again brought to astop.

When the locomotive is moving in the forward direction with theoperators control lever i3! out of Neutral position, the forwarddirectional control valve device 2!! will open communication between thefluid pressure supply pipe I80 and plunger chamber 206 in the forwardselector valve device .581 so as to actuate said device for open ingcommunication between the self-lapping speed control valve device areand diaphragm chamber 52 in the forward throttle adjusting motor 40, aspreviously described. It will thus be seen that in case of loss of fluidunder pressure from pipe Hill, the forward selector valve devicei81'will automatically operate to close communication between the speedcontrol valve device I90 and the forward throttle adjusting motor 40 andto release fluid under pressure from chamber $2 in said motor forcausing operation of said motor to cut ofi the supply of steam to theforward turbine. The same is true in case the operators control leverI3! is out of Neutral position in the direction for supplying fluidunder pressure to the reverse throttle adjusting motor 41 for causingmovement of the locomotive in the reverse direction. Thus, regardless ofthe direction of movement of' the locomotive, failure of the supply offluid under pressure to the fluid pressure supply pipe l8!) willautomatically effect the cutting ofi of the supply of steam to therespective turblue 9 or 1'2.

' The supply of fluid under pressure to pipe I85 is obtained from themain reservoir 88 through pipe '87, a suitable reducing valve device34!, pipe 342, a lubricant pressure interlock valve device 343 and speedlimiting means comprising a cutoff valve device 34 and forward andreverse speed limiting valve devices 345 and 346, respectively, whichare provided for controlling operation of said cut-off valve device.

The interlock valve device 343 comprises a plunger '341'which isslidably mounted in a suitable casing and also comprises a ring seal'348which is disposed in a recess encircling said plunger and having sealingand sliding contact 5 therewith for preventing leakage of fluid underpressure from a chamber M9 at one end of said plunger to a chamber 350at the opposite end, the chamber 350 being open to atmosphere through aport 35!. The plunger 3H is connected by a stem 352 to a fluid pressuresupply valve 353 contained in a chamber 354 to which the fluid pressuresupply pipe I89 is connected. The stem 352 extends through an opening ina wall 355 which is provided with a seat for engagement by the supplyvalve 353 to close communication through said opening between chamber 35and chamber 349. A spring 356 in chamber 354 acts on the supply valve353 for urging it into contact with its seat. The supply valve 353, stem352 and plunger 34"! are provided with a bore open at one end to chamber354 and open at the opposite end through a seat to chamber 350 whichcontains'a release valve351 arranged to cooperate with said seat forclosing communication between chambers-354 and 350.

The interlock valve device iii-3 further comprises a flexible diaphragm$53 clamped around its mar ginal edge in the casing in coaxial relationwith the release valve 351 and supply valve 353. At the side ofdiaphragm 358 adjacent the release valve 351 is a non-pressure chamber359 containing a follower 366 having one side engagin the diaphragm. Atthe opposite side of follower 366 is an annular stop 36I arranged to beenga d by said follower for limiting movement thereof and deflection ofthe diaphragm 358 in one direction. At the opposite side of diaphragm358 is a pressure chamber 362 into which extends a stop 363 arranged tobe engaged by said diaphragm for limiting movement thereof in theopposite direction.

The follower 366 has a stem 364 slidably mounted in a bore providedthrough an adjusting nut 365, and the end of this stem is connected tothe end of a stem 366 projecting from the release valve 351. Aprecompressed spring 361 encircling follower stem 364 bears at one endon the nut 365 while the opposite end bears against the follower 366 forurging said follower and the diaphragm 358 in the direction of stop 363.The pressure of this spring on the follower and on the diaphragm isadjusted by the regulating nut 365;

The pressure chamber 362 is connected to the discharge pipe 45 of theconstant speed lubricant pump 43 driven by turbine 42 so that thediaphragm 358 will be constantly subject in chamber 362 to the pressureof lubricant delivered by said pump. Assuming that the pump 43 operatesto maintain the intended substantially constant pressure of lubricant inpipe 45 of for instance 35 lbs., this pressure, effective in chamber 362on diaphragm 358 will overcome the opposing force of spring 361, andhold said diaphragm in the position in which it is shown in the drawingsfor seating the release valve 351 on plunger 341 and for shifting saidplunger to open the supply valve 353 for thereby opening communicationbetween the fluid pressure supply pipe I86 and a passage 368 leading tothe cut-off valve device 344.

The spring 361 may be adjusted to move the diaphragm 358 against theopposing pressure of lubricant in chamber 362 if the pressure of suchlubricant becomes reduced to a chosen low degree such as lbs., underwhich condition the diaphragm 358 will be moved by spring 361 intocontact with stop 363 to permit closing of valve 353 by spring 356 andopening of the release valve 361 by pressure of fluid from pipe I86.With the release valve 351 open, fluid under pressure will be releasedfrom the fluid pressure supply pipe I86. Thus, if, while the locomotiveis in motion, the pressure of lubricant delivered by the pump 43 forlubricating different parts of the locomotive and turbines should becomereduced to the undesirably low degree above mentioned, the

interlock valve device 343 will automatically operate to release fluidunder pressure from pipe I86 and thereby cause release of fluid underpressure from diaphragm chamber 62 in the forward or reverse throttleadjusting motor 46 or M, whichever is efiective, so as to out oi? thesupply of steam to the efiective turbine 9 or I2 of the locomotive toprovide for stopping of the locomotive.

Moreover it will be noted that in case the pump 43 fails to providesufilcient pressure in pipe 45 for actuating the interlock valve device343 to open the supply valve 353 therein, with the locomotive at astandstill, the fluid pressure supply pipe I86 will be maintained opento atmosphere so that the operator will be unable to supply steam toeither turbine to cause movement of the locomotive.

The cut-off valve device 344 comprises acesing having a chamber 369which is arranged to 32 be supplied with fluid under pressure from thereducing valve device 34I through pipe 342. The casing also has achamber 316 containing a fluid pressure supply valve 31I for controllingcommunication between chamber 369 and chamber.

316 and thus between the fluid pressure supply pipe 342 from thereducing valve device 34| and passage 368 which opens to chamber 316.The casing further comprises a plunger 312 slidably mounted in thecasing and subject on one side to pressure of fluid in chamber 316 andon the opposite side to pressure of fluid in a chamber 313 which is opento atmosphere through a passage 314. A sealing ring 315 is disposed in aThe plunger 312 is provided with a bore open at one end to chamber 316and has an internal valve seat for engagement by a release valve 386contained in said bore for controlling communication between chamber 316and chamber 313. This bore also contains a coil spring 38I acting on therelease valve 386 for urging it to its seated position as shown. Therelease valve 386 has a fluted stem 382 extending through the bore inthe plunger in the direction of chamber 316 and arranged for contact bya stem 383 projecting from the supply valve 31!. In chamber 313 a coilspring 384 encircles the plunger 312. One end of spring 384 bearsagainst a seat 385 which is secured for movement with the stem by amember 386. The opposite end of the spring is supported on a seat 381normally supported on the casing and having a flange 388 arranged tointerlock with a collar 389 on the plunger.

Due to the connections between spring 384 and plunger 312 through theseat 385 and due also to the fact that said spring is precompressedbetween the two seats, said spring exerts a certain pressure against thediaphragm 311 for urging same to the position in which it is shown inthe drawings. With the diaphragm 311 in this position, the release valve386 will be closed by spring 38I while the supply valve 31I may beopened by pressure of fluid from pipe 342 so that fluid from said pipewill flow to chamber 316 and thence through passage 368 to chamber 349in the lubricant interlock valve device 343.

With the parts of the interlock valve device 343 positioned as shown inthe drawing when the pressure of lubricant delivered by pump 43 exceedsthe chosen low degree, fluid supplied to passage 368 will be supplied tothe fluid pressure supply pipe I86. However, when fluid is supplied todiaphragm chamber 318, as will be later described, at a pressureexceeding the opposing force of spring 384, diaphragm 311 will deflectdownwardly to a position defined by contact between spring seat 385 anda stop shoulder 389 in the casing; This movement of diaphragm 311 andthereby of follower 316 will act through spring 38I and release valve386 to move the supply valve 31I into contact with its seat for cuttingoff the supply of fluid under pressure from the supply pipe 342 topassage 368 and thence to the

